Brake construction



Aug. 19 1924.

1,505,216 J. A. MYRICK BRAKE CONSTRUCTION 3 Sheets-Sheet 1 Filed May '7. 1923 Aug. 19 1924. 1,505,216

' J. A. MYRICK BRAKE CONSTRUCTION Filed May-7, 1923 3 Sheets-Sheet 2 1zT .E w

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Aug. 19 1924. 1,505,216

J. A. MYRICK BRAKE CONSTRUCTION Filed May 7, 1923 3 Sheets-Sheet 5 JUEE IH r ado warn Patented Aug. 19, 1924.

tlltw'ttta stares:

Josnrn a. MYRICKQIOF emoir, nonmncanomua;

BRAKE CONSTRUCTION.

Application filed May 7,

To all tlfiE O'HZ it may concern:

Be it known that I, JOSEPH A. MYRroK,

a citizen of the United States, residing at' Marion, in the county of McDowell and The primary object of "this invention is the provision of a very effective and 'd'urable type of brake construction, particularf ly well adapted for use upon the'traction wheels of automotive vehicles. i

' A. further object of :th'isfinvention isthe provision of a brake construction, emb ody ing means to obtain a maximum frictional braking effect upon a brake wheel, the brake shoe to o attain this end being;sectionally formed.

A further object of thisiinvention is the provision of a brake construction (of the above mentioned character embodying navel operating means.

Other objects and advantages of this in vention will be apparent during thecours'e;

of the following detailed description In the accompanying" drawing'syforming a part of this specification, and wherein.

similar reference characters designate correspondmg parts throughout the several views:

Figure 1 is a plan view of the rear running gear of an automotive vehiclepshowing j the traction wheels thereof and the'lmproved p p groove 16 over the bottom 19 of the groove, i

brake construction as associated ther'ei'viith.-

Figure 2 is an enlarged fragmentary View, partly in section showing novel cooperating features of the improved brake construction. k

Figure 3 is an enlarged fragmentary cross sectional view, taken substantially on the,

line 3-3 of Figure 2. i

Figure 4 is an enlarged fragmentary view, partly in cross section, showing no-vellco-f operating details of the improved brake construction. t

Figure 5 is a plan view of a detail used in this invention. i

' Figure 6 is a cross sectional view, taken substantially on the line 6-6 of Figural In the drawings, wherein for the purpose of illustration is shown but thexpreferred embodiment of this invention, the, letter A may generally designate the rear 1923. Serial No. 37,335,

il gssar t m sfitm t e vehi l the l ketjwlnch may include tract-ion wheels B of any approved construction having infiproved brake constructions G associated awe- Referring to the running gear A, the

sameinayh include'the housing 10, within whi'clithe axle and difflerential are encased foriconnection' to; the traction Wheels B.

'Referring'to one of thejbrake constructions C, the same preferably includes a brake wheel or drum .15 of any approved material or construction;providedinwardly of its outer periphery with a substantially V shaped groove 16.1" The groove 1.6' is so formed about the brake 'ivhe'el 15 as to provide the de surfaces 1? and I 18 converging toward the fazgi's of the brake wh'eel l5," and terminating atthe bottom 19 of the groove '1 i said eam; 119 The-ins n n r n,

face" circumferentiallyi about the wheel 15.

The wheellti is Ofcourse secured in any approved mannerto the *hub" or spoke struct re ofthe traction'j wheels B asterotate therewith; a Referringfto the braking arrangement uponthe wheel 15, it is preferred to provide similarly constructed brake shoe con structi'ons 25 26 at diametrically opposed "points in "the groove 16 of each wheel 15, and with which operating mechanisms 27 and 28 1respectively maybeprovided.

Each? of the brakes hoe constructions 25 and26fincludes a segmentalshoe section 30, which is substantially il shaped in cross sectionandopei'atesfin the lower part of the and for a short distance at the inner parts of thjegconvergingisides 17 and 18,substantially 'as 'isillustrated in Figure 2 of'the drawings. The shoe section 30 is provided with lining 83 offany approved type there on, connected thereto as by countersunk screw elements 341 It is preferred to pro- IOU videa stem or shaft 35 rigid or integral with the shoesection30, which extends radially 'outwardlyin horizontalmanner from the brake drum 15, andfisprovided with a series j scribed."

The shoeconstruction furthermore ineludes side sections and 38 for cooperat on outwardly of the inner shoe sect on 30 and respectively over the converglng groove sides 17 and 18. The sides of the sections 37 and 38 which face the converging sides 17 and 18 of the wheel groove 16 are preferably provided with lining 39 of any ap proved type, suitably secured to said shoe sections by counter sunk screw elements 40. From this description of the shoe construction it will be seen that the same is sectional, and in cross sections said sections provide a substantially V-shaped structure, which may cooperate in expansible manner Within the annular groove of the brake wheel.

Referring to the means for supporting the. brake shoe constructions upon the brake wheel 15, the same preferably comprises a supporting spider &5, which is connected to the axle housing 10, and provides supporting arms 16 which extend forwardly and rearwardly of the housing 10. 7

Each of the supporting arms 15 are pro vided with brackets 17 extending at right angles thereto toward the traction wheel, substantially as is illustrated in the drawings; the outer ends of the brackets 4:. on each arm 16 providing a pair of hingedly connected arms 48 and 19, which when connected togetherby a bolt or analogous securing element provide an opening 51 therethrough to slidably receive the shaft or stem 35 of a brake shoe construction. As it is preferred that two of the brackets d7 be provided for each stem or shaft 35, it is apparent that said shafts or stems may be slidably supported in horizontal manner for linear movement by the brake operating means.

Each of the brake constructions 25 and 26 has a web portion 35 extending radially outwardly in horizontal manner between the side shoe sections 37 and 38. In order to maintain the side shoe sections 37 and 38 of each brakeshoe construction in proper relation, a supporting member 53 is provided, having at oneend thereof outwardly extending legs 54L, which are connected upon the square shafts or pins 55; said shafts or pins 55 being connected as by bracket clips 56 to the shoe sections 37 and 38. The shoe sections 37 and 38 are laterally slidable upon the shaft 55, and it is preferred that compression springs 57 be provided at the inside surfaces of the legs 5%, normally engaging the same and the bracket clips 56 whereby the brake shoesections 37 and 38 may be forced toward each otherand toward the web 35 therebetween. The meme ber 53 also provides an extensionport'lon 60hav1ng a square opening 61 therein through whi'chthe stem 35 slidably extends.

It is obvious that upon the inward movement of the square shaft or stem 35 that the inner brake shoe section 30 be moved into engagement with the brake wheel 15. To provide forthe lateral expansion of the brake shoe sections 37 and 38 into engage ment with the brake wheel 15, it is preferred to provide anti-friction rollers 65 upon opposite sidesiof the web 35", which may operate upon inwardly converging surfaces 67 provided at the sides of the shoe sections 37 and 38 which face said anti-friction members 65, so that as the stem 35 is moved inwardly the rollers engaging the convergbrake wheel, it is preferred to provide for rules or collars 70 and 71 upon each square shaft 35; the collar 70 being attached outwardly ofth'e bracket member 53, while the collar or ferrule 71 is attached immediately below said member 53 and is adapted for contact thereagainstf Intermediate the extensionportion 60 of the bracket 53 and the outer ferrule or collar 70 a spiral compression spring 74 is provided, which normally acts to force the bracket or supporting member 53 into engagement with the inner collar 71,so that the two sections 37 and 38 may be maintained in a definite relation when the same are not applied in frictional engagement with the brake wheel. Spiral compression springs 77 may be provided intermediate the brake shoe section 30 and the other sections 37and 38 to maintain said sections in a definite relation so that there will be very little noise during release of the brakes, said springs tending to buff the brake release action.

Referring to the operating mechanisms 27 and 28 for the brake shoe constructions of a brake wheel 15, each of said operating; mechanisms includes a shaft 80- rotatably supported by bracket arms 81 carried outwardly of the spider arms 16; each of said shafts 80 having a pinion 82 at the end thereof in meshing relation with the rack 7 and havingat the ends thereof suitable link lever connections 91 which extend to the pinion shafts 80. The rocker-shaft '90 may be connected for operation by anycontrol rod 91 extending to the drivers compart ment of the vehicle. Similarly, the operating mechanism 28 contemplates the prov sion of a transverse rocker shaft 93 having the ends thereof connected by suitable link;

necessary to so rotate the'pinion shafts 8O that the pinions thereon in meshing relation with the rack teeth oi" the square shafts will move the latter-inwardly toward the brake wheels This will, of course, frictionally .force the inner brake shoe sections 30 of the shoe constructions 25 and 26 into engagement with the inner surfaces of the brake wheel groove 16. This movement Wlll also cause the anti-friction rollers to engage the converging surfaces 67 of the brake shoe sections 37 and, 38 to relatively move said sections 37 and 38 into frictional engagement with the converging sides 17 and 18 of the brake wheel 15. It is thus obvious that a maximum frictional contact of the brake shoe construction upon the brake wheel has been made which will effectively provide the desired braking upon the vehicle wheels B.

Various changes in the shape, size and arrangement of parts may be made to the form of invention herein shown and described, without departing from the spirit of this invention or the scope of the claims.

I claim:

1. A brake comprisinga grooved brake wheel, and a laterally expansible brake shoe device operable in the groove of said brake wheel.

2. A brake comprising a brake wheel, a

multipart brake shoe, and means for rela tively moving the parts of the brake shoe into engagement with the brake wheel.

3. A brake comprising a grooved brake wheel, a shoe of a plurality of parts operating within the groove of the brake wheel at opposite sides of said groove, and means For relatively moving the parts of the brake shoe within said groove for frictionally en gaging the sides of said groove.

4;. A brake comprising a brake wheel, a brake shoe operating in the wheel composed of a plurality of parts, and means operat ing intermediate said parts of the shoe whereby they may be moved away from each other to lock the shoe within said wheel.

5. A. brake comprising a brake wheel having a circumferential groove therein, a brake shoe construction including a pair of sections lying in the groove at opposite.

sides thereof, and operating means between said sections for laterally expanding the same'into engagement with the sides of said groove.

6. A, brake comprising a brake wheel having a circumferential groove therein, a brake, shoe construction including a pair of sections operating within said groove of the brake whee-l, an operating member radially movable withrespect-to the wheel. between said. sections, and anti-friction means rarriedbysaid member for engagef ment with the said brake shoe sections whereby said sectionsmay be relatively moved into engagement with said brake wheel upon radial movement of said operating member.

7. Abralre comprising abrake wheel, a

brake shoe construction, a shaft connectedto the. shoe'construction including a rack and operating means including a pinion intermeshing with said rack whereby the shoe construction-.may be operated into; exp-an sible engagementawith the brakewheel upon whereby they may be expanded into frictional en agement with their adjacent surfaces of tie brake wheel.

9. A brake comprising a brake wheel having a groove therein, a brake shoe construction comprising a section operable radially of the brake wheel in the inner part of the groove of said brake wheel, and a pair of sections operable laterally within the groove ofthe brake wheel, a member connected to. the first mentioned brake shoe section, means connecting said member with the laterally movable sections, and means for operating said member whereby the same may relatively move the brake shoe sections in the relation above described in eXpansible frictional engagement with the brake wheel. I

10. A brake comprising a brake wheel having a substantially V-shaped groove in the outer periphery thereof, a brake shoe construction operable at opposite points in the groove including a plurality of sections, and operating means for laterally and radially expanding the sections of the brake shoe construction within the groove of said wheel.

11. A brake comprising a brake wheel, a

sectional brake shoe operating on the brake surfaces of the different parts of the brake shoe construction, and means for moving said member whereby the parts of said shoe may be expanded into said brake whee-h '12. A brake comprising a brake wheel having a substantially V-shaped groove about the periphery thereof, brake shoe constructions mounted at diametrically opposed points in the groove of said wheel, and rack and pinion operating means for eX- panding or releasing said brake shoe construction in the groove of said brake wheel.

13. A brake of the class described comprising a brake wheel having a peripheral groove therein, a supporting spider carried adjacent said brake wheel, a shaft slidably carried by said spider radially movable with respect to said wheel, a shoe carried rigid with said slida'ble shaft adapted for frictional engagement within the groove of said brake wheel, brake shoes yieldably carried within said groove on opposite sides of said slidable shaft, and means movable with the slidable shaft ope-rating on converging surfaces of the shoes at opposite sides of said shaft whereby upon radial in- Ward movement of the shaft all of the brake shoes, may be expanded into engagement with the brake wheel.

' 14. A brake comprising a brake wheel having a peripheral groove substantially V-shaped in cross section about the periphery thereof, a supporting frame carried in stationary manner adjacent said wheel, shaft members supported in sliding manner by said frame for radial inward or outward movement with respect to said brake whee-l, a shoe section fixedly carried by said shaft adapted for frictional braking relation with the inner part of the groove of said brake wheel brake shoe sections within said f-shaped groove at opposite sides of the sliding shaft, means resiliently connecting said side shoe sections to said sliding shaft, said sliding shaft having rack teeth upon the outer end thereof, a pinion in meshing relation with said rack teeth, and operating means for said pinion whereby the sliding shaft may be moved inwardly or outwardly with respect to said brake wheel whereby the brake shoe sections may be expanded into frictional-engagement with the brake wheel or released therefrom.

JOSEPH A. MYRICK. 

